Graphene oxide-deposited tilted fiber grating for ultrafast humidity sensing and human breath monitoring

Jiang, Biqiang; Bi, Zhixuan; Hao, Zhen; Yuan, Qingchen; Feng, Dingyi; Zhou, Kaiming; Zhang, Lin; Gan, Xuetao

doi:10.1016/j.snb.2019.05.024

Cited by 104 publications

(49 citation statements)

References 41 publications

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“…These solutions allow RR monitoring from the oral or nasal airflow in the form of needle-like probes and temporary wearable devices (e.g., face masks and plates below the nostrils), with uniform FBGs and TFBGs working in reflection or in transmission [201], [202]. An FBG sensor inserted in a metallic needle and coated by agar was proposed in [179], [203], [204] for RR monitoring during both mechanical ventilation and human breathing.…”

Section: ) Respiratory Ratementioning

confidence: 99%

Fiber Bragg Gratings for Medical Applications and Future Challenges: A Review

et al. 2020

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In the last decades, fiber Bragg gratings (FBGs) have become increasingly attractive to medical applications due to their unique properties such as small size, biocompatibility, immunity to electromagnetic interferences, high sensitivity and multiplexing capability. FBGs have been employed in the development of surgical tools, assistive devices, wearables, and biosensors, showing great potentialities for medical uses. This paper reviews the FBG-based measuring systems, their principle of work, and their applications in medicine and healthcare. Particular attention is given to sensing solutions for biomechanics, minimally invasive surgery, physiological monitoring, and medical biosensing. Strengths, weaknesses, open challenges, and future trends are also discussed to highlight how FBGs can meet the demands of nextgeneration medical devices and healthcare system. INDEX TERMS biomechanics, biosensing, fiber Bragg grating sensors, minimally invasive surgery, physiological monitoring.

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Section: ) Respiratory Ratementioning

confidence: 99%

Fiber Bragg Gratings for Medical Applications and Future Challenges: A Review

et al. 2020

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“…Due to the tilted grating plane, TFGs could couple forward propagating core mode into polarization dependent forward/backward propagating cladding modes. So far, TFGs have been reported as various biochemical sensors [27][28][29][30][31][32][33] and physical sensors [19][20][21][34][35]. The relationship between resonance wavelength of cladding modes and surrounding refractive index (SRI) could be determined by phase match condition (PMC) of TFGs:…”

Section: B Cladding Mode Field Distributionsmentioning

confidence: 99%

Theoretical and Experimental Analysis of the Directional RI Sensing Property of Tilted Fiber Grating

Sun

Moreno

et al. 2021

J. Lightwave Technol.

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In this paper, we have theoretically and experimentally investigated the unique vector refractive index (RI) sensing property of tilted fiber grating (TFG). Due to the orthogonal symmetric grating structure, TFGs would mainly achieve the coupling between the fiber core mode and the two orthogonal polarization LP1m of cladding mode. And the numerical simulation results showed that the coupling coefficient between fundamental core mode to the LP1m cladding mode is higher than the others. In the experiment, we have furthermore observed the cladding mode field distribution of excessively TFG (Ex-TFG) and long period fiber grating (LPFG), which indicated that the evanescent field distribution of cladding mode of TFG shows an asymmetric near field distribution with two lobes oriented along the fast axis of TFG, and the one of LPFG has a circularly symmetric cladding mode field distribution. In addition, by employing side-immersion method, we have measured the azimuth RI sensitivities of Ex-TFG, tilted fiber Bragg grating (TFBG) and LPFG, which exhibited that both Ex-TFG and TFBG have shown a direction-dependency RI sensitivity, and the RI sensitivity with side-immersion along fast axis is almost half of the one along slow axis, and the RI sensitivity of LPFG is azimuth independent. Overall, the experiment results show that the TFGs inherently show unique directional RI sensing property, which could be potentially applied in vector sensing area.

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“…The measured results obtained from the rGO/PS-coated optical microfiber exhibited a sensitivity of −0.224 dB/%RH and −4.118 dB/%RH for detection range 50.5-70.6 %RH and 79.5-85 %RH, correspondingly. Overall, Table 3 summarizes all carbon allotrope-based RH OFS and their respective sensing performance [134,[147][148][149][150][151][152][153][154][155][156][157][158][159][160][161][162].…”

Section: Humiditymentioning

confidence: 99%

Carbon Allotrope-Based Optical Fibers for Environmental and Biological Sensing: A Review

Yap

Chan

Tjin

et al. 2020

Sensors

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Recently, carbon allotropes have received tremendous research interest and paved a new avenue for optical fiber sensing technology. Carbon allotropes exhibit unique sensing properties such as large surface to volume ratios, biocompatibility, and they can serve as molecule enrichers. Meanwhile, optical fibers possess a high degree of surface modification versatility that enables the incorporation of carbon allotropes as the functional coating for a wide range of detection tasks. Moreover, the combination of carbon allotropes and optical fibers also yields high sensitivity and specificity to monitor target molecules in the vicinity of the nanocoating surface. In this review, the development of carbon allotropes-based optical fiber sensors is studied. The first section provides an overview of four different types of carbon allotropes, including carbon nanotubes, carbon dots, graphene, and nanodiamonds. The second section discusses the synthesis approaches used to prepare these carbon allotropes, followed by some deposition techniques to functionalize the surface of the optical fiber, and the associated sensing mechanisms. Numerous applications that have benefitted from carbon allotrope-based optical fiber sensors such as temperature, strain, volatile organic compounds and biosensing applications are reviewed and summarized. Finally, a concluding section highlighting the technological deficiencies, challenges, and suggestions to overcome them is presented.2 of 43 of target molecules or physical parameters. In some instances, surface-modified carbon allotropes also permit multi-parameter detection capabilities of carbon allotrope-based OFS [7]. As such, an insight into the recent advances of carbon allotrope-based OFS can serve as a guideline to develop an effective detection approach for emerging real-world applications. Many review articles on carbon allotrope-based OFS mainly focus on a single type of carbon allotrope and the fundamental theory of carbon allotrope-based OFS [8,9]. Thus, this comprehensive review article encompasses the properties, preparation, sensing mechanisms, nanocoating deposition techniques, physical and biochemical sensing applications. This review aims to highlight the recent research work on carbon allotrope-based OFS that will serve as a reference guide for researchers to develop optimal detection approaches for physical parameters or trace level monitoring of chemical and biomolecules. Four groups of carbon allotropes, including carbon nanotubes (CNT), carbon dots (CDs), graphene, and nanodiamonds (NDs), will be studied. Commonly adopted synthesis approaches, classification of various deposition techniques for the integration of carbon allotropes as the thin film coating of OFS as well as numerous examples of these carbon allotrope-based OFS will also be outlined.

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Graphene oxide-deposited tilted fiber grating for ultrafast humidity sensing and human breath monitoring

Cited by 104 publications

References 41 publications

Fiber Bragg Gratings for Medical Applications and Future Challenges: A Review

Fiber Bragg Gratings for Medical Applications and Future Challenges: A Review

Theoretical and Experimental Analysis of the Directional RI Sensing Property of Tilted Fiber Grating

Carbon Allotrope-Based Optical Fibers for Environmental and Biological Sensing: A Review

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